Brake shoe structure



April 19, 1932. A. 'c. MOORE I 1,354,598

BRAKE SHOE STRUCTURE- Filed April 5, 1931 2 Sheets-Sheet 1 In Venfon April 19, 1932. C, MOORE v 1,854,598

RRRRRRRRRRRRRRRR RE ll v \I Patented Apr. :19, I 1932 UNITED STATES PATENT OFFICE nmimosE C. moon, or CHICAGO, ILLlZNOIS, MENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS BRAKE SHOE ASSIGNOR TO CHICAGO RAILWAY EQUIP- STRUCTURE App1ication filed April 8, 1931. Serial No. 527,578.

My invention relates to "railway rolling stock and consists particularly in a novel brake shoeand key structure.

At present, standard types ofbrake heads are provided with spaced toes at the top and bottom and with a pair of center lugs for cooperating with a center lug on' the brake. shoe in holding the head and shoe together. A key of greater curvature than the shoe and head ,is driven between the head toes and through the central head and shoe lugs,

causing the shoe and head to be tightly wedged together. The brake shoe is actually supported by the bearing of the lower surface'of the shoe lug against the top surface of the lower head center lug. Continuous tapping of the top eridof the shoe against the wheel.tread, es pecially where-the brake beam is unsupported, frequently causes these bearing surfaces tobecome worn. When this occurs, the assembly becomes looseand the top of the shoe falls. downwardly and outwardly away'from the upper head toes. The condition is fur-- ther aggravated by the bending of the shoe if the soft bearing portion is cracked.

A recent development in constructing brake heads has been the placing of a tie bar between the toes of the head to provide additional bearing surface between' head and .shoe, and also placing rearwardly extending loops or lugs on the extreme ,top and bottom ends of the shoe for engaging the key, to prevent the falling away of the shoe from the head, as described above. However,-due

" to discrepancies inthe radii of shoes and heads, the ordinary types of keys have been foundto bind between the top shoe lug; and

Y the top brake head tie bar causing distortion head wilLnot be tightly wedged together at of the key in driving so that the shoe and the center lugs.

' The object'of the present invention is to construct a brake shoe and key which may be assembled with the above type of'brake head without the disadvantages mentioned.- I attain this object and others later appearing substantially in the structure illustrated in the accompanying drawings in which-' Figure 1 is a vertical longitudinal section Figures 7, 8, 9, and 10 are detail longitu-' dinal sections showing various modifications of the key and shoe.

In Figure 1, I' show a brake head 1 similar 4 to the standard type of head now in general use except that tie bars 2 and 3 extend between the upper and lower airs of toes 4 and 5, respectively. The shoe lncludes a comparativelysoft bearing portion 6 and'a hard backing portion 7 and has the usual central lug including pin retaining loop 8 and ears 19 and 20 for insertion between the head lugs 9 and 10. Loops 11 and 12 project rearwardly from the extreme ends of the shoe and a key 13 having a retaining shoulder 21 is driven through loop 11, behind tie bar, 2

and through lugs 9, 8,, and 10. Suitable Opposing lugs or hook elements might be substituted for loops -11-and 12.

It will be seen that the key, while being driven, normally bears against the shoe at the top and also against the inner surfaces of the openings in the central lugs 8,9, and 10, thus causing the shoe and head to be wedged tightly together. "Loops or lugs 11 and, 12 are made large enough to permit the free passage of key 13 therethrough during initial driving,

but the key is provided with an offset 14 near shoulder 21 which engages the inner end of loop 11, when the key is driven down to the shoulder, thus preventing the top of the shoe from pulling away fromthe upper head toes.

A bottom loop 12 is provided to make the shoe uniform and-reversible.

In Figure 4, a pair of inwardly extending lugs 15 and 16 replace tie bars 2 and 3 fo providing additional bearing surface. The

function of the lugs is the same as that of the tie bars.

In Figures 5 and 6, modified forms of keys are shown in which, as in the former case, a

curved strap 18 replaces oifset 14 in Figure l,

and, as in the latter case, an enlargement 17 replaces the offset. The modified keys function the same as the form shown in Figure 1. In order to provide for possible discrepancies in radii of keys which would prevent a key from being driven completely down to the position shown in Figure 1, the contour of the upper portion of the key may be modifiedas in Figure 7 in which ofl'set'21 slopes more gently than the corresponding olfset 14 in Figure 1 and loop 22 is adapted to engage different points along the inner surface of the offset. *Notches 24 are provided along the convex rear surface of the key for co-operat ing with shoulder 25 on the brake head or.

the bar 22 on the brake shoe to, prevent the key 23 from working upwardly or from being lost in case the car is dumped. In this form the loop 22 is of rectangular section and comprises an extension on the hardened backing portion 26-of the shoe.

In Figure 8, no loop engaging offset is pro-.

vided at the upper end of the key 43, but enlargements 27 are formed on the concave prevent the key from working upwardly.

Bar 28 has a rounded inner surface for more effectually co-operating with the irregular bearing surface of the key. I

In Figure 9, I provide a hook 32 preferably formed out of the hardened backing-portion 33 of the shoe for engaging the transverse bar 34 extending between the lower pair ofhead toes 35. Thishook serves to maintain the bottom end of the shoe 36 in close engagement with the head toes. Key 37 bears against the rear surface of hook 32 instead of against the transverse bar, as in Figures 1 to 5.

In Figure 10, hook 38, near the lower end of shoe 39, is bifurcated to'permit key 40 to directly engage transverse bar 42. In this form the deflection of the lower part of the key is lessthan in Figure9.

Obviously, the key, shoe, and head may be otherwise varied as to details without departing from the spirit of my invention and I contemplate the exclusive use of all such variations as come Within the scope of my claims.

I claim:

1. In combination, a brake head including spaced toes at the upper and lower ends thereee awe of and spaced centrally located key retaining lugs, a brake shoe having a central lug inserted between said head lugs and top and bottom loop elements projecting over the ends of said head, and a key shaped to pass freely through said top element during driving and to tightly wedge said shoe and head lugs together, said key having an offset near the top thereof shaped to engage said top element to hold adjacent portions of said head and shoe firmly together.

2. In combination, a brake shoe having a center lug for receiving a key and loops at each end extending away from the braking surface thereof, a brake head having lugs on each side of said shoe lug and spaced toes at each end having tie bars extending therebetween, and a retaining key shaped to pass, during driving, freely through one of said loops and behind the adjacent tie bar, and to bind said center shoe and head lugs tightly together, said key having an offset portion at the top shaped to engage said loop whereby said key, loop, and top. tie bar cooperate when the key is completely driven to hold together adjacent surfaces of said shoe and head.

3. In combination, a brake shoe having a loop at one end extending. away from the braking surface thereof, a brake head adapted to mount said shoe, and a key for holding said shoeand head together comprising a body portion shaped to pass freely through said loop during driving, a shoulder at the top end thereof, and a projecting element near the intersection of said body and shoulder, said element being adapted to engage said loop when the key is completely driven to hold together adjacent portions of said shoe and head.

4. In combination, a brake head having spaced toes at the upper and lower extremity thereof and opposing lugs on said toes, a brake shoe mounted on said head and having a loop extending rearwardly from at least one end thereof, and a retaining key adapted to pass freely through said loop during driving and at the same time engage said lugs and additional retaining elements on said head and shoe, said key having an offset portion near the top thereof for engaging said'loop to hold together adjacent portions'of said headand shoe.

5. In combination, a railway brake head and shoe having the usual co-operating lugs a center lug located between said head lugs gether, and having an offset near the'top thereof adapted to engage said loop when'the key is completely driven, said loop, offset, and tie bar cooperating to hold adj acent' portions of said head and shoe together without affecting the engagement of said key with.

said center lugs. 7. In combination, a brake head including spaced toes at one end, a brake shoe having a loo at one end extending away from the bra ing surface thereof, and a key shaped to passfreely through said loop and through said toes during driving and wedge said head and shoe together at the center and to engage said loopwhen driven as far as possible to hold together adjacent portions of said head and shoe, said key having a notch engaginga shoulder on said head to restrain withdrawal ofsaidkey. j p

8. In combination, a brake heaid ipcluding spaced toes at one end and a transverse bar extending therebetween, a brakeshoe mount ed on said head and having a loop extending above said toes, and a key shaped to pass freely throughsaid loop and between said toes during driving and to wedge together said head and' shoe, said key havlng a notch in the rear surface thereof and an enlargement opposite said notch engaging said bar when said keyis completely-driven to forcev ortion of said key against said shoe'lug to old together adjacent portions of said head and shoe, and to force said notch the upper against a portion of said head between said toes to restrain withdrawal of. said key.

9. In combination, a brake head having a pair of spaced toes at each end and a transverse bar extending between one pair thereof,

a brake'shoe mounted on said head and includin a hook element engagingsaid bar to hold together adjacent end portions of said a head and shoe, and a keywedging together said head andshoe at the ce'nte-ri 10. In combination, a brake head including spaced pairs of toes at top and bottom, each.

pair of toes having a transverse bar extend- -ing therebetween, a brake'shoe mounted on said head and having a loop at each end overlapping said head, a key shaped to pass freely through said top loop and top head toes during driving and to wedge said head .and shoe tightly together at the center, said key having a portion near the top. adapted to engage said top loop when said key is completely driven to hold together adjacent end portions of said head and shoes, and a hook member projecting from said shoe and adapt ed to engage the transverse bar between said lower toes-to hold together said head and shoe at the bottom.

c 11 In combination, a brake head including braking surface thereof, and-a key shaped to pass freely'through said loop and through said toes during driving and wedge said head and shoe together at the center and toengage said l'oop when driven as far as possible to hold together adjacent portions of said head and shoe, there being interengaging serrated elements on said head and key to restrain withdrawal of said key.

. 12. A brake shoe key including an elongated wedge-like body portion having 'f orwardly and rearwardly facing surfaces, said spaced toes at one end, abrake shoe having a .loop at one end extending away from the rearwardly facing surface having a rearwardly and upwardly inclined oflset forengaging the cross bar of a re'arwardly projecting brakeshoe loop. I 13. A brake shoe key including an elon-' gated wedge-like, body portion having forbody being offset to provide an element for engaging the bar of a 'rearwardly projecting brake shoe loop.

14. A brake shoekey having a resilient rearwardly facing pro ection spaced from theintermediate part thereof, for engaging the -opposing bar of a rearwardly extending brake shoe loop, and having a forwardly :wardly and rearwardly facing-surfaces, said facing portion adjacent said projection for engaging an opposing brake head element, whereby said key may thrust together the parts of a brake head and shoe adjacent said projection and portion without affecting the binding together of the head and shoe center lugs. u 7

15. A brake shoe key including an elongated wedgelike body portion having forwardly and rearwardly facing surfaces, said rearwardly facing surface includin an .element for yieldingly engaging the, ar of a rearwardly extending brake shoe loop. I 16. In combination, a brake'shoe having a center lug and. having a rearward-1y extending loop spaced from said center lug, a brake head having spaced center lugs, for receiving said shoe lug between them, andhaving a recess spaced from said center lugs, and a key passing through said shoe and said center lugs and thereby wedging the shoe to the head and also having a part passing through interengaging notch and shoulder restraining the withdrawal of said key.

19. In combination, a brake shoe having a loop extending away from the braking surface thereof, a brake head to which said shoe is applied in the usual manner, and a key holding said shoe andhead together and comprising a body portion shaped to pass freely through said loop during driving of the key and having a retaining shoulder at its upper end, there being an element on the rear surface of said bodyportion adjacent to said shoulder and engaging said loop when the key is completely driven to thrust said shoe against the upper portion of said head.

20. Incombination, a brake head having a pair of spaced toes at the end thereof and a transverse bar extending between said toes,

" *a brake SllOGIllOllIlted on said head and ineluding a hook element engaging said bar .to hold together the portions of said head and shoe adjacent thereto, and a key wedging together said head and shoe at the center in the usuahmanner.

' 21. In combination, a brake head including centrally located spaced lugs, a brake shoe having a central lug inserted between said head lugs and havlng a rearwardly projecting loop elementat its upper end, and

a key passing through said lugs to tightly wedge said shoe against said head lugs, said key having an offset near the upper end thereof engaging said element to thrust the upper portion of said shoe towards the upper portion of said head.

22. A structure as set forth in claim 21 in which said head includes elements spaced above said lugs and engaging the forward face of said key.

23. A structure as set forth in olaini'21 in which said shoe has a corresponding loop element at its lower end whereby said shoe is reversible.

24. In combination, a brake head including spaced pairs of toes at top and bottom, each pair of toes including a transverse element, a brake shoe mounted on said head and having a loop at each end overlapping the end of said head, said head and shoe having the usual center'lugs, a key shaped topass freely through said top loop and top head toes during driving and also passing through said center lugs to wedge said head and shoe tightly together at the center, and a hook member projecting from 'saidshoe and engaging the' transverse element between said lower toes \to hold said head and shoe assembled at the bottom, said key having a portion near its top engaging the upper of said loops and transverse elements, when said key is completely driveinto thrust the upper portion of said shoe towards said head. In testimony whereof I hereunto affix my signature this 20th day of March, 1931.

AMBROSE C. MOORE.

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